20
QuizMultiple Choice

Chemical Reactions — Test

Question 20 • Chemistry

Which statement correctly describes the actual yield and the theoretical yield of a reaction?

Answer
A
The actual yield is calculated from the reactant amounts, but the theoretical yield must be measured for each instance of a reaction.
B
The actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts.
C
The actual yield represents the maximum yield possible, and the theoretical yield assumes perfect reaction conditions.
D
The actual yield is calculated from the amount of the limiting reactant, and the theoretical yield is calculated from the amount of the excess reactant.

Explanation

Theoretical yield is the maximum amount of product predicted from the reactant amounts, using the limiting reactant and assuming the reaction proceeds completely. Actual yield is the amount of product obtained in practice, so it can be affected by reaction conditions, side reactions, or product loss. Therefore, the correct statement is that actual yield depends on reaction conditions, while theoretical yield varies with reactant amounts.

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